Micrel, Inc.
Precision Edge
5GHz, 1:2 LVPECL FANOUT
SY58012U
Precision Edge
®
BUFFER/TRANSLATOR
SY58012U
WITH INTERNAL INPUT TERMINATION
®
FEATURES
Precision 1:2, 800mV LVPECL fanout buffer
Guaranteed AC performance over temperature/
voltage:
• > 5GHz f
MAX
(clock)
• < 110ps t
r
/ t
f
times
• < 260ps t
pd
• < 15ps max skew
Low jitter performance
• < 10ps
PP
total jitter (clock)
• < 1ps
RMS
random jitter (data)
• < 10ps
PP
deterministic jitter (data)
Accepts an input signal as low as 100mV
Unique input termination and V
T
pin accepts DC-
and AC-coupled differential inputs: LVPECL, LVDS,
and CML
Outputs are 100k LVPECL compatible, 800mV swing
Power supply 2.5V
±
5% and 3.3V
±
10%
–40
°
C to +85
°
C temperature range
Available in 16-pin (3mm
×
3mm) MLF
®
package
Precision Edge
®
DESCRIPTION
The SY58012U is a 2.5V/3.3V precision, high-speed, fully
differential 1:2 LVPECL fanout buffer. Optimized to provide
two identical output copies with less than 15ps of skew and
less than 10ps
(pk-pk)
total jitter, the SY58012U can process
clock signals as fast as 5GHz or 5Gbps data.
The differential input includes Micrel’s unique, 3-pin input
termination architecture that interfaces to LVPECL, LVDS
or CML differential signals, (AC-coupled or DC-coupled) as
small as 100mV without any level-shifting or termination
resistor networks in the signal path. For AC-coupled input
interface applications, an on-board output reference voltage
(V
REF-AC
) is provided to bias the V
T
pin. The outputs are
100k LVPECL compatible, with extremely fast rise/fall times
guaranteed to be less than 110ps.
The SY58012U operates from a 2.5V
±5%
supply or
3.3V
±10%
supply and is guaranteed over the full industrial
temperature range (–40°C to +85°C). For applications that
require faster rise/fall times, or greater bandwidth, consider
the SY58013U 1:2 fanout buffer with 400mV output swing,
or the SY58011 1:2 CML (400mV) fanout buffer. The
SY58012U is part of Micrel’s high-speed, Precision Edge
®
product line. Data sheets and support documentation can
be found on Micrel’s web site at www.micrel.com.
APPLICATIONS
s
s
s
s
All SONET and GigE clock distribution
Fibre Channel clock and data distribution
Backplane distribution
High-end, low skew, multiprocessor synchronous
clock distribution
FUNCTIONAL BLOCK DIAGRAM
TYPICAL PERFORMANCE
2.5GHz Output
V
CC
= 3.3V
IN
50Ω
V
T
50Ω
/IN
V
REF
-AC
TIME (50ps/div.)
/Q0
Q1
/Q1
Output Swing
(200mV/div.)
Q0
2GHz with 100mV Input
Precision Edge is registered trademark of Micrel, Inc.
MicroLeadFrame
and MLF are registered trademarks of Amkor Technology, Inc.
M9999-020207
hbwhelp@micrel.com or (408) 955-1690
Rev.: D
Amendment: /0
1
Issue Date: February 2007
MICREL [ MICREL SEMICONDUCTOR ]
